Update: Influenza Activity — United States, 2010–11 Season, and Composition of the 2011–12 Influenza Vaccine

During the 2010-11 influenza season, influenza activity* first began to increase in the southeastern United States, and peaked nationally in early February. Compared with the previous pandemic year (2009-10), higher rates of hospitalization were observed for persons aged≥65 years during the 2010-11...

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Bibliographic Details
Published in:MMWR. Morbidity and mortality weekly report 2011-06, Vol.60 (21), p.705-712
Main Authors: Kniss, Krista, Epperson, Scott, Blanton, Lenee, Mustaquim, Desiree, Bishop, Amber, D'Mello, Tiffany, Perez, Alejandro, Dhara, Rosaline, Brammer, Lynnette, Gubareva, Larisa, Wallis, Teresa, Xu, Xiyan, Bresee, Joseph, Klimov, Alexander, Cox, Nancy, Finelli, Lyn
Format: Article
Language:English
Subjects:
Adolescent
Adult
Age Factors
Aged
Child
Child, Preschool
Death
Diseases
Female
H1N1 subtype influenza A virus
H3N2 subtype influenza A virus
Hospitalization
Hospitalization - statistics & numerical data
Humans
Infant
Influenza
Influenza A virus
Influenza A Virus, H1N1 Subtype - isolation & purification
Influenza A Virus, H3N2 Subtype - isolation & purification
Influenza vaccines
Influenza Vaccines - administration & dosage
Influenza, Human - complications
Influenza, Human - epidemiology
Influenza, Human - prevention & control
Male
Middle Aged
Mortality
Pandemics
Pneumonia - etiology
Pneumonia - mortality
Population Surveillance
Surveillance
United States - epidemiology
Vaccines
Viruses
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Summary:During the 2010-11 influenza season, influenza activity* first began to increase in the southeastern United States, and peaked nationally in early February. Compared with the previous pandemic year (2009-10), higher rates of hospitalization were observed for persons aged≥65 years during the 2010-11 season, whereas lower hospitalization rates were observed in younger populations than during the pandemic year. Overall, the percentages of outpatient visits for influenza-like illness (ILI) were lower during the 2010-11 season than the 2009-10 pandemic influenza season. In the United States, influenza A (H3N2) remained the predominant virus throughout the season; however, 2009 influenza A (H1N1) and influenza B viruses also circulated, and the predominant virus varied by U.S. Department of Health and Human Service (HHS) region and week. This report summarizes influenza activity in the United States during the 2010-11 influenza season (October 3, 2010-May 21, 2011) and describes the components of the 2011-12 Northern Hemisphere influenza vaccine.
ISSN:0149-2195
1545-861X